IQ3Shader.h

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// Copyright (C) 2006-2012 Nikolaus Gebhardt / Thomas Alten
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#ifndef __I_Q3_LEVEL_SHADER_H_INCLUDED__
#define __I_Q3_LEVEL_SHADER_H_INCLUDED__

#include "irrArray.h"
#include "fast_atof.h"
#include "IFileSystem.h"
#include "IVideoDriver.h"
#include "coreutil.h"

namespace irr
{
namespace scene
{
namespace quake3
{

    static core::stringc irrEmptyStringc("");

    enum eQ3MeshIndex
    {
        E_Q3_MESH_GEOMETRY = 0,
        E_Q3_MESH_ITEMS,
        E_Q3_MESH_BILLBOARD,
        E_Q3_MESH_FOG,
        E_Q3_MESH_UNRESOLVED,
        E_Q3_MESH_SIZE
    };

    struct Q3LevelLoadParameter
    {
        Q3LevelLoadParameter ()
            :defaultLightMapMaterial ( video::EMT_LIGHTMAP_M4 ),
            defaultModulate ( video::EMFN_MODULATE_4X ),
            defaultFilter ( video::EMF_BILINEAR_FILTER ),
            patchTesselation ( 8 ),
            verbose ( 0 ),
            startTime ( 0 ), endTime ( 0 ),
            mergeShaderBuffer ( 1 ),
            cleanUnResolvedMeshes ( 1 ),
            loadAllShaders ( 0 ),
            loadSkyShader ( 0 ),
            alpharef ( 1 ),
            swapLump ( 0 ),
    #ifdef __BIG_ENDIAN__
            swapHeader ( 1 )
    #else
            swapHeader ( 0 )
    #endif
            {
                memcpy ( scriptDir, "scripts\x0", 8 );
            }

        video::E_MATERIAL_TYPE defaultLightMapMaterial;
        video::E_MODULATE_FUNC defaultModulate;
        video::E_MATERIAL_FLAG defaultFilter;
        s32 patchTesselation;
        s32 verbose;
        u32 startTime;
        u32 endTime;
        s32 mergeShaderBuffer;
        s32 cleanUnResolvedMeshes;
        s32 loadAllShaders;
        s32 loadSkyShader;
        s32 alpharef;
        s32 swapLump;
        s32 swapHeader;
        c8 scriptDir [ 64 ];
    };

    // some useful typedefs
    typedef core::array< core::stringc > tStringList;
    typedef core::array< video::ITexture* > tTexArray;

    // string helper.. TODO: move to generic files
    inline s16 isEqual ( const core::stringc &string, u32 &pos, const c8 *list[], u16 listSize )
    {
        const char * in = string.c_str () + pos;

        for ( u16 i = 0; i != listSize; ++i )
        {
            if (string.size() < pos)
                return -2;
            u32 len = (u32) strlen ( list[i] );
            if (string.size() < pos+len)
                continue;
            if ( in [len] != 0 && in [len] != ' ' )
                continue;
            if ( strncmp ( in, list[i], len ) )
                continue;

            pos += len + 1;
            return (s16) i;
        }
        return -2;
    }

    inline f32 getAsFloat ( const core::stringc &string, u32 &pos )
    {
        const char * in = string.c_str () + pos;

        f32 value = 0.f;
        pos += (u32) ( core::fast_atof_move ( in, value ) - in ) + 1;
        return value;
    }

    inline core::vector3df getAsVector3df ( const core::stringc &string, u32 &pos )
    {
        core::vector3df v;

        v.X = getAsFloat ( string, pos );
        v.Z = getAsFloat ( string, pos );
        v.Y = getAsFloat ( string, pos );

        return v;
    }


    /*
        extract substrings
    */
    inline void getAsStringList ( tStringList &list, s32 max, const core::stringc &string, u32 &startPos )
    {
        list.clear ();

        s32 finish = 0;
        s32 endPos;
        do
        {
            endPos = string.findNext ( ' ', startPos );
            if ( endPos == -1 )
            {
                finish = 1;
                endPos = string.size();
            }

            list.push_back ( string.subString ( startPos, endPos - startPos ) );
            startPos = endPos + 1;

            if ( list.size() >= (u32) max )
                finish = 1;

        } while ( !finish );

    }

    struct SBlendFunc
    {
        SBlendFunc ( video::E_MODULATE_FUNC mod )
            : type ( video::EMT_SOLID ), modulate ( mod ),
                param0( 0.f ),
            isTransparent ( 0 ) {}

        video::E_MATERIAL_TYPE type;
        video::E_MODULATE_FUNC modulate;

        f32 param0;
        u32 isTransparent;
    };

    // parses the content of Variable cull
    inline bool getCullingFunction ( const core::stringc &cull )
    {
        if ( cull.size() == 0 )
            return true;

        bool ret = true;
        static const c8 * funclist[] = { "none", "disable", "twosided" };

        u32 pos = 0;
        switch ( isEqual ( cull, pos, funclist, 3 ) )
        {
            case 0:
            case 1:
            case 2:
                ret = false;
                break;
        }
        return ret;
    }

    // parses the content of Variable depthfunc
    // return a z-test
    inline u8 getDepthFunction ( const core::stringc &string )
    {
        u8 ret = video::ECFN_LESSEQUAL;

        if ( string.size() == 0 )
            return ret;

        static const c8 * funclist[] = { "lequal","equal" };

        u32 pos = 0;
        switch ( isEqual ( string, pos, funclist, 2 ) )
        {
            case 0:
                ret = video::ECFN_LESSEQUAL;
                break;
            case 1:
                ret = video::ECFN_EQUAL;
                break;
        }
        return ret;
    }


    inline static void getBlendFunc ( const core::stringc &string, SBlendFunc &blendfunc )
    {
        if ( string.size() == 0 )
            return;

        // maps to E_BLEND_FACTOR
        static const c8 * funclist[] =
        {
            "gl_zero",
            "gl_one",
            "gl_dst_color",
            "gl_one_minus_dst_color",
            "gl_src_color",
            "gl_one_minus_src_color",
            "gl_src_alpha",
            "gl_one_minus_src_alpha",
            "gl_dst_alpha",
            "gl_one_minus_dst_alpha",
            "gl_src_alpha_sat",

            "add",
            "filter",
            "blend",

            "ge128",
            "gt0",
        };


        u32 pos = 0;
        s32 srcFact = isEqual ( string, pos, funclist, 16 );

        if ( srcFact < 0 )
            return;

        u32 resolved = 0;
        s32 dstFact = isEqual ( string, pos, funclist, 16 );

        switch ( srcFact )
        {
            case video::EBF_ZERO:
                switch ( dstFact )
                {
                    // gl_zero gl_src_color == gl_dst_color gl_zero
                    case video::EBF_SRC_COLOR:
                        blendfunc.type = video::EMT_ONETEXTURE_BLEND;
                        blendfunc.param0 = video::pack_textureBlendFunc ( video::EBF_DST_COLOR, video::EBF_ZERO, blendfunc.modulate );
                        blendfunc.isTransparent = 1;
                        resolved = 1;
                        break;
                } break;

            case video::EBF_ONE:
                switch ( dstFact )
                {
                    // gl_one gl_zero
                    case video::EBF_ZERO:
                        blendfunc.type = video::EMT_SOLID;
                        blendfunc.isTransparent = 0;
                        resolved = 1;
                        break;

                    // gl_one gl_one
                    case video::EBF_ONE:
                        blendfunc.type = video::EMT_TRANSPARENT_ADD_COLOR;
                        blendfunc.isTransparent = 1;
                        resolved = 1;
                        break;
                } break;

            case video::EBF_SRC_ALPHA:
                switch ( dstFact )
                {
                    // gl_src_alpha gl_one_minus_src_alpha
                    case video::EBF_ONE_MINUS_SRC_ALPHA:
                        blendfunc.type = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
                        blendfunc.param0 = 1.f/255.f;
                        blendfunc.isTransparent = 1;
                        resolved = 1;
                        break;
                } break;

            case 11:
                // add
                blendfunc.type = video::EMT_TRANSPARENT_ADD_COLOR;
                blendfunc.isTransparent = 1;
                resolved = 1;
                break;
            case 12:
                // filter = gl_dst_color gl_zero or gl_zero gl_src_color
                blendfunc.type = video::EMT_ONETEXTURE_BLEND;
                blendfunc.param0 = video::pack_textureBlendFunc ( video::EBF_DST_COLOR, video::EBF_ZERO, blendfunc.modulate );
                blendfunc.isTransparent = 1;
                resolved = 1;
                break;
            case 13:
                // blend = gl_src_alpha gl_one_minus_src_alpha
                blendfunc.type = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
                blendfunc.param0 = 1.f/255.f;
                blendfunc.isTransparent = 1;
                resolved = 1;
                break;
            case 14:
                // alphafunc ge128
                blendfunc.type = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
                blendfunc.param0 = 0.5f;
                blendfunc.isTransparent = 1;
                resolved = 1;
                break;
            case 15:
                // alphafunc gt0
                blendfunc.type = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
                blendfunc.param0 = 1.f / 255.f;
                blendfunc.isTransparent = 1;
                resolved = 1;
                break;

        }

        // use the generic blender
        if ( 0 == resolved )
        {
            blendfunc.type = video::EMT_ONETEXTURE_BLEND;
            blendfunc.param0 = video::pack_textureBlendFunc (
                    (video::E_BLEND_FACTOR) srcFact,
                    (video::E_BLEND_FACTOR) dstFact,
                    blendfunc.modulate);

            blendfunc.isTransparent = 1;
        }
    }

    // random noise [-1;1]
    struct Noiser
    {
        static f32 get ()
        {
            static u32 RandomSeed = 0x69666966;
            RandomSeed = (RandomSeed * 3631 + 1);

            f32 value = ( (f32) (RandomSeed & 0x7FFF ) * (1.0f / (f32)(0x7FFF >> 1) ) ) - 1.f;
            return value;
        }
    };

    enum eQ3ModifierFunction
    {
        TCMOD               = 0,
        DEFORMVERTEXES      = 1,
        RGBGEN              = 2,
        TCGEN               = 3,
        MAP                 = 4,
        ALPHAGEN            = 5,

        FUNCTION2           = 0x10,
        SCROLL              = FUNCTION2 + 1,
        SCALE               = FUNCTION2 + 2,
        ROTATE              = FUNCTION2 + 3,
        STRETCH             = FUNCTION2 + 4,
        TURBULENCE          = FUNCTION2 + 5,
        WAVE                = FUNCTION2 + 6,

        IDENTITY            = FUNCTION2 + 7,
        VERTEX              = FUNCTION2 + 8,
        TEXTURE             = FUNCTION2 + 9,
        LIGHTMAP            = FUNCTION2 + 10,
        ENVIRONMENT         = FUNCTION2 + 11,
        DOLLAR_LIGHTMAP     = FUNCTION2 + 12,
        BULGE               = FUNCTION2 + 13,
        AUTOSPRITE          = FUNCTION2 + 14,
        AUTOSPRITE2         = FUNCTION2 + 15,
        TRANSFORM           = FUNCTION2 + 16,
        EXACTVERTEX         = FUNCTION2 + 17,
        CONSTANT            = FUNCTION2 + 18,
        LIGHTINGSPECULAR    = FUNCTION2 + 19,
        MOVE                = FUNCTION2 + 20,
        NORMAL              = FUNCTION2 + 21,
        IDENTITYLIGHTING    = FUNCTION2 + 22,

        WAVE_MODIFIER_FUNCTION  = 0x30,
        SINUS               = WAVE_MODIFIER_FUNCTION + 1,
        COSINUS             = WAVE_MODIFIER_FUNCTION + 2,
        SQUARE              = WAVE_MODIFIER_FUNCTION + 3,
        TRIANGLE            = WAVE_MODIFIER_FUNCTION + 4,
        SAWTOOTH            = WAVE_MODIFIER_FUNCTION + 5,
        SAWTOOTH_INVERSE    = WAVE_MODIFIER_FUNCTION + 6,
        NOISE               = WAVE_MODIFIER_FUNCTION + 7,


        UNKNOWN             = -2

    };

    struct SModifierFunction
    {
        SModifierFunction ()
            : masterfunc0 ( UNKNOWN ), masterfunc1( UNKNOWN ), func ( SINUS ),
            tcgen( TEXTURE ), rgbgen ( IDENTITY ), alphagen ( UNKNOWN ),
            base ( 0 ), amp ( 1 ), phase ( 0 ), frequency ( 1 ),
            wave ( 1 ),
            x ( 0 ), y ( 0 ), z( 0 ), count( 0 ) {}

        // "tcmod","deformvertexes","rgbgen", "tcgen"
        eQ3ModifierFunction masterfunc0;
        // depends
        eQ3ModifierFunction masterfunc1;
        // depends
        eQ3ModifierFunction func;

        eQ3ModifierFunction tcgen;
        eQ3ModifierFunction rgbgen;
        eQ3ModifierFunction alphagen;

        union
        {
            f32 base;
            f32 bulgewidth;
        };

        union
        {
            f32 amp;
            f32 bulgeheight;
        };

        f32 phase;

        union
        {
            f32 frequency;
            f32 bulgespeed;
        };

        union
        {
            f32 wave;
            f32 div;
        };

        f32 x;
        f32 y;
        f32 z;
        u32 count;

        f32 evaluate ( f32 dt ) const
        {
            // phase in 0 and 1..
            f32 x = core::fract( (dt + phase ) * frequency );
            f32 y = 0.f;

            switch ( func )
            {
                case SINUS:
                    y = sinf ( x * core::PI * 2.f );
                    break;
                case COSINUS:
                    y = cosf ( x * core::PI * 2.f );
                    break;
                case SQUARE:
                    y = x < 0.5f ? 1.f : -1.f;
                    break;
                case TRIANGLE:
                    y = x < 0.5f ? ( 4.f * x ) - 1.f : ( -4.f * x ) + 3.f;
                    break;
                case SAWTOOTH:
                    y = x;
                    break;
                case SAWTOOTH_INVERSE:
                    y = 1.f - x;
                    break;
                case NOISE:
                    y = Noiser::get();
                    break;
                default:
                    break;
            }

            return base + ( y * amp );
        }


    };

    inline core::vector3df getMD3Normal ( u32 i, u32 j )
    {
        const f32 lng = i * 2.0f * core::PI / 255.0f;
        const f32 lat = j * 2.0f * core::PI / 255.0f;
        return core::vector3df(cosf ( lat ) * sinf ( lng ),
                sinf ( lat ) * sinf ( lng ),
                cosf ( lng ));
    }

    //
    inline void getModifierFunc ( SModifierFunction& fill, const core::stringc &string, u32 &pos )
    {
        if ( string.size() == 0 )
            return;

        static const c8 * funclist[] =
        {
            "sin","cos","square",
            "triangle", "sawtooth","inversesawtooth", "noise"
        };

        fill.func = (eQ3ModifierFunction) isEqual ( string,pos, funclist,7 );
        fill.func = fill.func == UNKNOWN ? SINUS : (eQ3ModifierFunction) ((u32) fill.func + WAVE_MODIFIER_FUNCTION + 1);

        fill.base = getAsFloat ( string, pos );
        fill.amp = getAsFloat ( string, pos );
        fill.phase = getAsFloat ( string, pos );
        fill.frequency = getAsFloat ( string, pos );
    }


    // name = "a b c .."
    struct SVariable
    {
        core::stringc name;
        core::stringc content;

        SVariable ( const c8 * n, const c8 *c = 0 ) : name ( n ), content (c) {}
        virtual ~SVariable () {}

        void clear ()
        {
            name = "";
            content = "";
        }

        s32 isValid () const
        {
            return name.size();
        }

        bool operator == ( const SVariable &other ) const
        {
            return 0 == strcmp ( name.c_str(), other.name.c_str () );
        }

        bool operator < ( const SVariable &other ) const
        {
            return 0 > strcmp ( name.c_str(), other.name.c_str () );
        }

    };


    // string database. "a" = "Hello", "b" = "1234.6"
    struct SVarGroup
    {
        SVarGroup () { Variable.setAllocStrategy ( core::ALLOC_STRATEGY_SAFE ); }
        virtual ~SVarGroup () {}

        u32 isDefined ( const c8 * name, const c8 * content = 0 ) const
        {
            for ( u32 i = 0; i != Variable.size (); ++i )
            {
                if ( 0 == strcmp ( Variable[i].name.c_str(), name ) &&
                    (  0 == content || strstr ( Variable[i].content.c_str(), content ) )
                    )
                {
                    return i + 1;
                }
            }
            return 0;
        }

        // searches for Variable name and returns is content
        // if Variable is not found a reference to an Empty String is returned
        const core::stringc &get( const c8 * name ) const
        {
            SVariable search ( name );
            s32 index = Variable.linear_search ( search );
            if ( index < 0 )
                return irrEmptyStringc;

            return Variable [ index ].content;
        }

        // set the Variable name
        void set ( const c8 * name, const c8 * content = 0 )
        {
            u32 index = isDefined ( name, 0 );
            if ( 0 == index )
            {
                Variable.push_back ( SVariable ( name, content ) );
            }
            else
            {
                Variable [ index ].content = content;
            }
        }


        core::array < SVariable > Variable;
    };

    struct SVarGroupList: public IReferenceCounted
    {
        SVarGroupList ()
        {
            VariableGroup.setAllocStrategy ( core::ALLOC_STRATEGY_SAFE );
        }
        virtual ~SVarGroupList () {}

        core::array < SVarGroup > VariableGroup;
    };


    struct IShader
    {
        IShader ()
            : ID ( 0 ), VarGroup ( 0 )  {}
        virtual ~IShader () {}

        void operator = (const IShader &other )
        {
            ID = other.ID;
            VarGroup = other.VarGroup;
            name = other.name;
        }

        bool operator == (const IShader &other ) const
        {
            return 0 == strcmp ( name.c_str(), other.name.c_str () );
            //return name == other.name;
        }

        bool operator < (const IShader &other ) const
        {
            return strcmp ( name.c_str(), other.name.c_str () ) < 0;
            //return name < other.name;
        }

        u32 getGroupSize () const
        {
            if ( 0 == VarGroup )
                return 0;
            return VarGroup->VariableGroup.size ();
        }

        const SVarGroup * getGroup ( u32 stage ) const
        {
            if ( 0 == VarGroup || stage >= VarGroup->VariableGroup.size () )
                return 0;

            return &VarGroup->VariableGroup [ stage ];
        }

        // id
        s32 ID;
        SVarGroupList *VarGroup; // reference

        // Shader: shader name ( also first variable in first Vargroup )
        // Entity: classname ( variable in Group(1) )
        core::stringc name;
    };

    typedef IShader IEntity;

    typedef core::array < IEntity > tQ3EntityList;

    /*
        dump shader like original layout, regardless of internal data holding
        no recursive folding..
    */
    inline void dumpVarGroup ( core::stringc &dest, const SVarGroup * group, s32 stack )
    {
        core::stringc buf;
        s32 i;


        if ( stack > 0 )
        {
            buf = "";
            for ( i = 0; i < stack - 1; ++i )
                buf += '\t';

            buf += "{\n";
            dest.append ( buf );
        }

        for ( u32 g = 0; g != group->Variable.size(); ++g )
        {
            buf = "";
            for ( i = 0; i < stack; ++i )
                buf += '\t';

            buf += group->Variable[g].name;
            buf += " ";
            buf += group->Variable[g].content;
            buf += "\n";
            dest.append ( buf );
        }

        if ( stack > 1 )
        {
            buf = "";
            for ( i = 0; i < stack - 1; ++i )
                buf += '\t';

            buf += "}\n";
            dest.append ( buf );
        }

    }

    inline core::stringc & dumpShader ( core::stringc &dest, const IShader * shader, bool entity = false )
    {
        if ( 0 == shader )
            return dest;

        const SVarGroup * group;

        const u32 size = shader->VarGroup->VariableGroup.size ();
        for ( u32 i = 0; i != size; ++i )
        {
            group = &shader->VarGroup->VariableGroup[ i ];
            dumpVarGroup ( dest, group, core::clamp( (int)i, 0, 2 ) );
        }

        if ( !entity )
        {
            if ( size <= 1 )
            {
                dest.append ( "{\n" );
            }
            dest.append ( "}\n" );
        }
        return dest;
    }


    /*
        quake3 doesn't care much about tga & jpg
        load one or multiple files stored in name started at startPos to the texture array textures
        if texture is not loaded 0 will be added ( to find missing textures easier)
    */
    inline void getTextures(tTexArray &textures,
                const core::stringc &name, u32 &startPos,
                io::IFileSystem *fileSystem,
                video::IVideoDriver* driver)
    {
        static const char* extension[] =
        {
            ".jpg",
            ".jpeg",
            ".png",
            ".dds",
            ".tga",
            ".bmp",
            ".pcx"
        };

        tStringList stringList;
        getAsStringList(stringList, -1, name, startPos);

        textures.clear();

        io::path loadFile;
        for ( u32 i = 0; i!= stringList.size (); ++i )
        {
            video::ITexture* texture = 0;
            for (u32 g = 0; g != 7 ; ++g)
            {
                core::cutFilenameExtension ( loadFile, stringList[i] );

                if ( loadFile == "$whiteimage" )
                {
                    texture = driver->getTexture( "$whiteimage" );
                    if ( 0 == texture )
                    {
                        core::dimension2du s ( 2, 2 );
                        u32 image[4] = { 0xFFFFFFFF, 0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF };
                        video::IImage* w = driver->createImageFromData ( video::ECF_A8R8G8B8, s,&image );
                        texture = driver->addTexture( "$whiteimage", w );
                        w->drop ();
                    }

                }
                else
                if ( loadFile == "$redimage" )
                {
                    texture = driver->getTexture( "$redimage" );
                    if ( 0 == texture )
                    {
                        core::dimension2du s ( 2, 2 );
                        u32 image[4] = { 0xFFFF0000, 0xFFFF0000,0xFFFF0000,0xFFFF0000 };
                        video::IImage* w = driver->createImageFromData ( video::ECF_A8R8G8B8, s,&image );
                        texture = driver->addTexture( "$redimage", w );
                        w->drop ();
                    }
                }
                else
                if ( loadFile == "$blueimage" )
                {
                    texture = driver->getTexture( "$blueimage" );
                    if ( 0 == texture )
                    {
                        core::dimension2du s ( 2, 2 );
                        u32 image[4] = { 0xFF0000FF, 0xFF0000FF,0xFF0000FF,0xFF0000FF };
                        video::IImage* w = driver->createImageFromData ( video::ECF_A8R8G8B8, s,&image );
                        texture = driver->addTexture( "$blueimage", w );
                        w->drop ();
                    }
                }
                else
                if ( loadFile == "$checkerimage" )
                {
                    texture = driver->getTexture( "$checkerimage" );
                    if ( 0 == texture )
                    {
                        core::dimension2du s ( 2, 2 );
                        u32 image[4] = { 0xFFFFFFFF, 0xFF000000,0xFF000000,0xFFFFFFFF };
                        video::IImage* w = driver->createImageFromData ( video::ECF_A8R8G8B8, s,&image );
                        texture = driver->addTexture( "$checkerimage", w );
                        w->drop ();
                    }
                }
                else
                if ( loadFile == "$lightmap" )
                {
                    texture = 0;
                }
                else
                {
                    loadFile.append ( extension[g] );
                }

                if ( fileSystem->existFile ( loadFile ) )
                {
                    texture = driver->getTexture( loadFile );
                    if ( texture )
                        break;
                    texture = 0;
                }
            }
            // take 0 Texture
            textures.push_back(texture);
        }
    }


    class IShaderManager : public IReferenceCounted
    {
    };

} // end namespace quake3
} // end namespace scene
} // end namespace irr

#endif